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Financial Instruments - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 7,250	$ 7,250
Unamortized debt discount / debt issuance costs	(63)	(66)
Current portion of long-term debt	600	600
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	5	11
Long-term debt, net of discount and issuance costs	6,592	6,595
Senior Notes
Debt Instrument [Line Items]
Debt, principal amount			$ 1,500	$ 1,250	$ 1,250	$ 3,650
Senior Notes \| 2018 floating senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	$ 300	300
Senior Notes \| 2018 floating senior notes due 2021 \| LIBOR
Debt Instrument [Line Items]
Interest rate percentage	0.44%
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Interest rate percentage	3.25%
Debt, principal amount	$ 300	300
Senior Notes \| 3.250% 2013 senior notes due 2023
Debt Instrument [Line Items]
Interest rate percentage	3.25%
Debt, principal amount	$ 1,350	1,350
Senior Notes \| 4.500% 2015 senior notes due 2025
Debt Instrument [Line Items]
Interest rate percentage	4.50%
Debt, principal amount	$ 750	750
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Interest rate percentage	3.00%
Debt, principal amount	$ 750	750
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Interest rate percentage	3.90%
Debt, principal amount	$ 500	500
Senior Notes \| 2.000% 2020 senior notes due 2030
Debt Instrument [Line Items]
Interest rate percentage	2.00%
Debt, principal amount	$ 750	750
Senior Notes \| 4.700% 2013 senior notes due 2043
Debt Instrument [Line Items]
Interest rate percentage	4.70%
Debt, principal amount	$ 1,150	1,150
Senior Notes \| 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Interest rate percentage	3.95%
Debt, principal amount	$ 500	500
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Interest rate percentage	4.45%
Debt, principal amount	$ 400	400
Senior Notes \| 3.000% 2020 senior notes due 2050
Debt Instrument [Line Items]
Interest rate percentage	3.00%
Debt, principal amount	$ 500	$ 500